Cat biscuit



FIG. 1 is a front elevational view of a cat biscuit showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof; and

FIG. 4 is a cross sectional view taken along line 4-4 of FIG. 1. 

The ornamental design for a cat biscuit, substantially as shown and described. 